Classification There is a debate over whether Solenogastres should be a subclass of a Class Aplacophora or a separate class. The phylogenetic relationships of aplacophoran molluscs are not unambiguously resolved although the data at hand (see Haszprunar 2000: American Malacological Bulletin 15, 115-130, and Glaubrecht, Maitas & Salvini-Plawen, 2005: Mitteilungen aus der Museum für Naturkunde in Berlin – Zoologische Reihe 81, 145-166) would support a relationship like Solenogastres(Caudofoveata(Polyplacophora(Conchifera)))) making Aplacophora paraphyletic. For this reason, contra the Aculiferan hypothesis of Scheltema (1993: Biological Bulletin 184, 57-78) and in agreement with the European school of Salvini-Plawen, Solenogastres and caudofoveata are given full class status. [details]

Classification Supraspecific classification used herein is essentially based on Salvini-Plawen (1978), also summarized in García–Álvarez & Salvini-Plawen (2007). [details]

Classification Originally proposed as a group of "worms" of uncertain affinity, to include both Neomenia and Chaetoderma, which are respectively representative of the Solenogastres (in the modern acception) anc Caudofoveata. At that time the group was not considered as related to the Mollusca [details]